KR20160057127A - Display apparatus and control method thereof - Google Patents

Abstract

Provided is a display apparatus to detect various objects including a user to execute various corresponding response actions in accordance with detecting results. According to an embodiment of the present invention, the display apparatus installed in one installation surface comprises: a display to display an image; a sensing module including a circuit part to generate a wireless transmission signal, a transmitting part making electrical contact with the circuit part and transmitting the wireless transmission signal from the circuit part to an external sensed-object, and a receiving part making electrical contact with the circuit part and receiving a wireless reception signal reflected by the sensed-object; and at least one processor to determine that the sensed-object has moved if a change in amplitude of the wireless transmission signal and the wireless reception signal through the sensing module is greater than a preset first threshold value and if a phase difference between the wireless transmission signal and the wireless reception signal is greater than a preset second threshold value, and performing a preset corresponding signal process in accordance with the determination results.

Description

[0001] DISPLAY APPARATUS AND CONTROL METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for processing image data according to an image processing process for displaying image data by itself or outputting image data for displaying an image from an external device, The present invention relates to a display device and a control method thereof that detect movement of various objects including a user in a use environment of the display device and execute various corresponding operations according to the detection result.

The image processing apparatus processes image signal / image data received from the outside according to various image processing processes. The image processing apparatus can display the processed image data on the display panel of the self-contained display panel or output the processed image signal to the display device so that the image data is displayed on the other display device having the panel. That is, the image processing apparatus can include both a case including a panel capable of displaying an image and a case not including a panel, as long as the apparatus is capable of processing image data. An example of the former case is a TV, An example of a set-top box is a set-top box.

The image processing apparatus or the display apparatus provides one or more types of use environments such as actively operating the user or detecting various types of actions of the user so that a corresponding operation according to the user's intention can be performed. For example, the image processing apparatus performs a corresponding operation in response to an operation signal received from a remote controller or a menu key operated by a user, and further, The gesture of the user detected through the content or operation sensor, and the corresponding operation can be executed according to the analysis result.

A variety of design schemes can be applied as to how to detect any type of action of the user. One example is the use of a Doppler radar sensor as a kind of radar system using a Doppler effect, There is a structure to detect and judge. Since the Doppler radar sensor uses a radio frequency (RF) signal, if the noise is mixed in the transmission and reception of the RF signal, the detection result of the sensor may be adversely affected. Therefore, it is important to detect and eliminate the influence of noise from the detection result of the Doppler radar sensor in order to ensure the accuracy of the sensor detection result.

According to an embodiment of the present invention, a display device installed on a mounting surface includes a display unit for displaying an image; A transmission unit for generating a transmission radio signal, a transmission unit for making electrical contact with the circuit unit and transmitting the transmission radio signal from the circuit unit to an external device to be sensed by an external device, A sensing module including a receiver for receiving a received wireless signal; If the amplitude variation of the transmission radio signal and the reception radio signal through the sensing module is greater than a predetermined first threshold value and the phase difference between the transmission radio signal and the reception radio signal is greater than a predetermined second threshold value, And at least one processor for determining that the body has moved and performing a predetermined corresponding signal processing according to the determination result. Thus, it is possible to increase the accuracy of the detection result of the movement of the touch sensing object by discriminating and eliminating the case of noise or disturbance, which is not caused by movement of the touch sensing object, out of the sensing results from the sensing module.

Here, the at least one processor may be configured such that if the amplitude variation is larger than the first threshold value and the phase difference is not greater than the second threshold value, the at least one processor does not move the subject but does not move due to signal interference between the transmitting unit and the receiving unit It is determined that noise has occurred, and the corresponding signal processing may not be performed. As a result, it is possible to discriminate the case of noise or disturbance in the case where the amplitude change is larger than the first threshold value.

The at least one processor generates a first signal obtained by synthesizing the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal, The phase difference can be determined by comparing the amplitude of the third signal generated based on the difference in amplitude between the first signal and the second signal to the second threshold value. Here, the phase shift value of the transmission radio signal at the time of generating the second signal may be 90 degrees. The third signal may include at least one of a difference of the second signal to the first signal, a difference of the first signal to the second signal, an absolute value of a difference between the first signal and the second signal, And may be generated based on any one of n squared differences between the first signal and the second signal. Thereby, even when direct calculation of the phase difference is difficult, it is possible to easily determine the degree of the phase difference indirectly.

The at least one processor generates a first signal obtained by synthesizing the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal, The amplitude of the transmitted radio signal and the amplitude of the received radio signal can be determined by comparing the amplitude of a fourth signal generated by normalization processing of the first signal and the second signal to the first threshold value . Here, the normalization process may be performed according to any one of a signal envelope operation and a norm operation. Thereby, before the phase difference between the transmitted wireless signal and the received wireless signal is determined, it is possible to determine the time when the movement of the touching object occurs or the time when noise occurs.

The at least one processor may determine that the subject does not move if the amplitude variation of the transmission radio signal and the reception radio signal is not greater than the first threshold value. Thus, it is possible to determine the time period during which the subject does not move and no noise occurs.

According to another aspect of the present invention, there is provided a method of controlling a display device installed on a mounting surface, the method comprising: transmitting a transmission radio signal from an external device to an external device; Receiving a reception radio signal reflected by the surface of sight sensor by a reception unit; If the amplitude change of the transmission radio signal and the reception radio signal is larger than a predetermined first threshold value and the phase difference between the transmission radio signal and the reception radio signal is larger than a predetermined second threshold value, And performing predetermined correspondence signal processing according to the determination result. Thereby, in detecting the movement of the touch-sensitive substrate based on the radio signal, it is possible to increase the accuracy of the detection result of movement of the touch-sensitive substrate by discriminating and eliminating the case of noise or disturbance, not by the movement of the touch- .

If it is determined that noise is generated due to signal interference between the transmitter and the receiver without the movement of the sensing object, if the amplitude variation is larger than the first threshold value and the phase difference is not greater than the second threshold value, And not performing the corresponding signal processing. As a result, it is possible to discriminate the case of noise or disturbance in the case where the amplitude change is larger than the first threshold value.

The determining may further include: generating a first signal obtained by synthesizing the transmission radio signal and the received radio signal, and a second signal synthesized with the received radio signal by shifting the transmission radio signal; And comparing the amplitude of the third signal generated based on the difference in amplitude between the first signal and the second signal with the second threshold value to determine the phase difference. Here, the phase shift value of the transmission radio signal at the time of generating the second signal may be 90 degrees. The third signal may include at least one of a difference of the second signal to the first signal, a difference of the first signal to the second signal, an absolute value of a difference between the first signal and the second signal, And may be generated based on any one of n squared differences between the first signal and the second signal. Thereby, even when direct calculation of the phase difference is difficult, it is possible to easily determine the degree of the phase difference indirectly.

The determining may further include: generating a first signal obtained by synthesizing the transmission radio signal and the received radio signal, and a second signal synthesized with the received radio signal by shifting the transmission radio signal; And comparing the amplitude of the fourth signal generated by the normalization process of the first signal and the second signal to the first threshold to determine the amplitude change of the transmitted wireless signal and the received wireless signal can do. Here, the normalization process may be performed according to any one of a signal envelope operation and a norm operation. Thereby, before the phase difference between the transmitted wireless signal and the received wireless signal is determined, it is possible to determine the time when the movement of the touching object occurs or the time when noise occurs.

The method may further include determining that the subject does not move if the amplitude change of the transmitted wireless signal and the received wireless signal is not greater than the first threshold value. Thus, it is possible to determine the time period during which the subject does not move and no noise occurs.

1 is an exemplary view of an image processing apparatus according to an embodiment of the present invention;
Fig. 2 is a block diagram of the configuration of the image processing apparatus of Fig.
3 is an exemplary diagram schematically showing the principle of the Doppler effect,
Fig. 4 is an exemplary view showing the principle of a Doppler radar sensor in a manner of sensing the speed of an object,
5 is an exemplary view showing the principle of an IQ type Doppler radar sensor,
6 shows an example in which the phase relationship between two signals is in a ground state and a case in which a phase is in a true phase,
FIG. 7 is an exemplary view of a Doppler radar sensor applied to the image processing apparatus of FIG. 1;
FIG. 8 is a block diagram of the sensing unit of the image processing apparatus of FIG. 1;
9 is an exemplary diagram showing the principle of signal envelope computation,
10 is a diagram showing waveform changes of the I- and Q- signals when the object is moved and when the disturbance occurs,
FIG. 11 is a flowchart showing a process of determining whether an object is moved by the image processing apparatus of FIG. 1;
FIG. 12 is a flowchart illustrating a process of determining a phase difference in order to determine whether or not an image processing apparatus of FIG.
13 is a graph showing an example of waveforms of I- and Q- signals derived according to experimental results according to an embodiment of the present invention,
14 is a graph showing an example of the waveform of the C- signal based on the I- and Q- signals shown in Fig. 13,
15 is a graph showing an example of the waveform of the D- signal based on the I- signal and the Q- signal shown in Fig. 13,
FIG. 16 is a graph in which the time interval A1 in FIG. 13 is enlarged,
FIG. 17 is a graph in which the time interval A1 in FIG. 14 is enlarged,
FIG. 18 is a graph in which the time interval A1 in FIG. 15 is enlarged,
FIG. 19 is a graph in which the time interval A2 in FIG. 13 is enlarged,
20 is a graph in which the time interval A2 in Fig. 14 is enlarged,
FIG. 21 is a graph obtained by enlarging the time interval A2 in FIG. 15,
22 is a block diagram of a configuration of an image processing apparatus according to another embodiment of the present invention;
23 is a flowchart of a control method of an image processing apparatus according to another embodiment of the present invention,
Fig. 24 is an exemplary view showing one installation form of the Doppler radar sensor of the present invention, Fig.
25 is an exemplary view showing a rear view of a display device according to another embodiment of the present invention;
26 is a cross-sectional view of the main portion showing a state of being cut along the line AA in the display device of FIG. 25,
27 to 29 are exemplary diagrams showing an example in which a predetermined operation is performed in the display device in accordance with whether the user is moving or not.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

If the term includes an ordinal such as a first component, a second component, or the like in the embodiment, such term is used to describe various components, and the term is used to distinguish one component from another And these components are not limited in meaning by their terms. The terms used in the embodiments are applied to explain the embodiments, and do not limit the spirit of the present invention.

In addition, in the embodiment, only the configurations directly related to the concept of the present invention will be described, and the other configurations will not be described. However, it is to be understood that, in the implementation of the apparatus or system to which the spirit of the present invention is applied, it is not meant that the configuration omitted from the description is unnecessary. It should be understood that terms such as " comprise "or" have "in the embodiments are intended to specify that there is a feature, a number, a step, an operation, an element or a combination thereof disclosed in the specification, , ≪ / RTI > an operation, an element, or a combination thereof.

1 is an exemplary diagram of an image processing apparatus 100 according to an embodiment of the present invention.

As shown in FIG. 1, the image processing apparatus 100 is a display device having a display unit 130 for displaying images on its own, and is implemented as a TV among them. However, the image processing apparatus 100 may be implemented not only as a display device having the display unit 130, but also as a form without the display unit 130. Examples of the former include a monitor, an electronic blackboard, an electronic frame, an electronic billboard, and the latter examples include a set-top box and a multimedia player. The image processing apparatus 100 may have various other forms. The concept of the present invention is applied to the image processing apparatus 100, which is installed and used mainly in one place, rather than a mobile form that the user freely carries and uses. Of course, the idea of the present invention can be applied not only to a video processing apparatus but also to an electronic apparatus having a function not related to a video image.

The image processing apparatus 100 processes an image data / video signal received from the outside, such as a broadcast signal, according to a predetermined process, and displays the image / video signal on the display unit 130. If the display unit 130 is not provided, the image processing apparatus 100 transmits image data to a corresponding display device (not shown) so that an image is displayed on another display apparatus (not shown).

The image processing apparatus 100 supports various functions related to the image or not directly related to the image including the image data processing function. The image processing apparatus 100 executes a predetermined function or operation according to input events of various types from the user U in order to actually implement the functions supported by the image processing apparatus 100 in the use environment.

One type of structure for the image processing apparatus 100 to receive an input event from the user U is a remote controller separated from the image processing apparatus 100 or a menu key installed outside the image processing apparatus 100 The user U may directly operate the input unit 140 such as the user. Another type of structure is a case where the user senses a change in the state of the user U by the sensing unit 160 including various types of sensors instead of operating the input unit 140 have. The present embodiment describes a structure in which the sensing unit 160 senses the moving state of the user U. FIG.

In the present embodiment, a case is described where the user U is the person to be sensed by the sensing unit 160. However, a creature other than a person or a self-operated machine such as a robot may be a sensing object of the sensing unit 160 have.

For example, in response to the user U moving toward or away from the image processing apparatus 100, the image processing apparatus 100 may be turned on when the system power of the image processing apparatus 100 is turned off, State or a state in which the system power is turned on and the system is turned off. If the system U is turned off and the user U senses that the user U is moving toward the image processing apparatus 100, the sensing unit 160 may detect that the moving direction of the user U is image processing It is possible to detect whether the device 100 is approaching or departing.

Further, for example, the image processing apparatus 100 can execute the function of switching the system power supply in response to the speed at which the user U moves. If the speed at which the user U moves is greater than a predetermined threshold value, the sensing unit 160 may sense and calculate the moving speed of the user U when the system power is switched.

For example, the sensing unit 160 may be a CW Doppler radar sensor that applies a Doppler effect to the sensing unit 160, . The sensing unit 160 of the Doppler radar system can sense the moving speed and the moving direction of the user U while moving, and the detailed structure and operation principle of the sensing unit 160 will be described later.

Hereinafter, the specific configuration of the image processing apparatus 100 of the present invention will be described.

2 is a block diagram of the configuration of the image processing apparatus 100. As shown in FIG.

2, the image processing apparatus 100 includes a communication unit 110 for communicating data and signals with the outside, a processing unit 120 for processing data received by the communication unit 110 according to a predetermined process, A display unit 130 for displaying image data processed in the processing unit 120 as an image, an input unit 140 for receiving an input operation by a user, a storage unit 150 for storing data, And a control unit 170 for controlling various operations of the display device 100 including the processing unit 120. The control unit 170 controls the operation of the display unit 100,

The communication unit 110 performs transmission and reception of data through a local network or a network so that the image processing apparatus 100 can perform bidirectional communication with the outside. For example, the communication unit 110 transmits and receives data through a wired / wireless wide area network To an external device (not shown). The communication unit 110 may be implemented by an access port or an aggregate of modules according to each communication standard and may be a protocol for connection or an external device (not shown) Or format. The communication unit 110 may be incorporated in the image processing apparatus 100 and may be additionally installed in the image processing apparatus 100 in an add-on or dongle form The format is also possible.

The communication unit 110 can transmit and receive signals based on individual communication protocols to each connected device. In the case of video data, for example, the communication unit 110 may include a radio frequency (RF) signal, a composite / component video, a super video, a SCART, a high definition multimedia interface (HDMI) (DisplayPort), UDI (unified display interface), or wireless HD.

The processing unit 120 performs various processes on the data / signal received by the communication unit 110. [ When the image data is received in the communication unit 110, the processing unit 120 performs an image processing process on the image data, and outputs the processed image data to the display unit 130, To be displayed. Alternatively, when the signal received by the communication unit 110 is a broadcast signal, the processing unit 120 extracts video, audio, and additional data from the broadcast signal tuned to a specific channel, adjusts the video to a preset resolution, 130).

The type of the image processing process performed by the processing unit 120 is not limited. For example, decoding and interlace image data corresponding to a video image data format may be converted into a progressive De-interlacing, scaling to adjust image data to a predetermined resolution, noise reduction for improving image quality, detail enhancement, frame refresh rate conversion, etc. . ≪ / RTI >

Since the processing unit 120 can perform various processes according to the type and characteristics of the data, the processing unit 120 can not limit the processes that can be performed by the processing unit 120 to the image processing process, Quot;), " For example, when the user's utterance is input to the image processing apparatus 100, the processing unit 120 can process the utterance according to a predetermined voice processing process. The processor 120 may include a system-on-chip (SOC) that integrates various functions or an individual chip-set capable of independently performing each of the processes, (Not shown), and is built in the image processing apparatus 100.

The display unit 130 displays the image signal / image data processed by the processing unit 120 as an image. The display unit 130 may be implemented by a variety of methods including liquid crystal, plasma, light-emitting diode, organic light-emitting diode, surface- a carbon nano-tube, a nano-crystal, or the like.

The display unit 130 may further include an additional configuration depending on the implementation method thereof. For example, in the liquid crystal type, the display unit 130 includes a liquid crystal display panel (not shown), a backlight unit (not shown) for supplying light to a liquid crystal display panel (not shown), a liquid crystal display panel (Not shown) for driving the panel driving board (not shown).

The input unit 140 transmits various preset control commands or information to the control unit 170 according to a user's operation or input. The input unit 140 informs various events generated by the user's operation according to the intention of the user and transmits the information to the control unit 170. For example, the input unit 140 may be a key / button installed outside the image processing apparatus 100, or may be a key / button provided outside the image processing apparatus 100. The input unit 140 may be implemented in various forms in order to generate input information from the user. Or may be a remote controller communicating with the communication unit 110 or may be a touch screen integrated with the display unit 130. [

The storage unit 150 stores various data under the control of the controller 170. The storage unit 150 is implemented as a non-volatile memory such as a flash memory or a hard-disc drive so as to save data regardless of whether or not the system power is supplied. The storage unit 150 may be accessed by the processing unit 120 or the control unit 160 to read, write, modify, delete, update, Is performed.

The sensing unit 160 senses the moving state of the user with respect to the image processing apparatus 100. Specifically, the sensing unit 160 determines whether the user is moving or stopped with respect to the image processing apparatus 100, and if the user moves, the user moves to the image processing apparatus 100 Or whether the user moves in a direction away from the image processing apparatus 100. [ The sensing unit 160 transmits the detection result to the controller 170 so that the controller 170 performs a preset operation or function corresponding to the detection result. In this embodiment, the sensing unit 160 includes a Doppler radar type sensor for sensing the movement state of the user, and a detailed description thereof will be described later.

The sensing unit 160 may include only one type of sensor or a plurality of different types of sensors. For example, the sensing unit 160 may include only a Doppler radar type sensor, or may additionally include various sensors such as an infrared sensor and a camera.

The control unit 170 is implemented by a CPU and controls the operation of the image processing apparatus 100 according to the occurrence of a specific event. For example, the control unit 170 controls the processing unit 120 so that when the communication unit 110 receives the video data of a specific content, the video data is processed and displayed on the display unit 130 as an image. Alternatively, the control unit 170 controls the processing unit 120 and other components such that a preset operation corresponding to a corresponding event is performed when an input event of a user is generated through the input unit 140.

In particular, the control unit 170 controls the predetermined operation based on the detection result from the sensing unit 160 in the present embodiment. For example, the control unit 170 may control the system power to be switched depending on whether the user moves from the sensing unit 160 to approach the image processing apparatus 100 or moves away from the image sensing apparatus.

Hereinafter, the sensing unit 160 of the present invention will be described in detail. As described above, the sensing unit 160 includes a Doppler radar sensor. Basically, the Doppler radar sensor is implemented by applying the principle of the Doppler effect.

3 is an exemplary diagram schematically showing the principle of the Doppler effect.

As shown in FIG. 3, for example, the horn sound of the train 210 moving rapidly as it hurls and hurks away from the horn sounds in a peculiar form. That is, when the train 210 approaches the observer 220, the horn sounds high to the observer 220, but when the train 210 moves away from the observer 230, the horn sounds lower to the observer 230 . This is because, when at least one of the sounding object 210 and the observers 220 and 230 moves, the sound is heard by the observers 220 and 230 in a waveform different from the original sound. This phenomenon is caused by a universal Phenomenon. This phenomenon is called the Doppler phenomenon and was discovered by Austrian physicist J. C. Doppler in 1842. That is, the Doppler effect is a phenomenon in which the frequency of the excitation of the excitation is changed by the observer when one or both of the excitation and the excitation is in motion.

The Doppler effect can be expressed mathematically in the case of sound waves as follows.

Assume that a sound source that sounds a frequency f ₀ (Hz) approaches a stationary observer with a velocity v _s (m / s), and a negative velocity is v (m / s). The ridge of a sound wave coming from a sound source at a point of time advances by v for a second, between which the sound source advances by v _s and gives a floor of sound wave f ₀ . In the direction in which the sound source travels, since the floor of the wave is f ₀ between (vv _s ), the wavelength λ ₁ becomes as shown in the following equation and becomes shorter than when the sound source is stopped.

[Equation 1]

However, since the traveling speed of the wave does not change, the frequency f ₁ of the sound satisfies the following equation by the observer.

&Quot; (2) "

In other words, the frequency increases and sounds higher than the actual sound.

On the contrary, the frequency f < ₁ > when the sound source moves away satisfies the following equation.

&Quot; (3) "

Next, it can be assumed that the source is stationary and the observer approaches v ₀ (m / s) toward the source. Since the sound source is stationary, the wavelength of a sound wave propagating in space is λ = v / f _0, but for a moving viewer, the floor of the wave approaches the velocity (v + v ₀ ). As a result, the frequency f ₂ of the wave satisfies the following equation for the observer.

&Quot; (4) "

On the other hand, when both the sound source and the observer move, assuming that the direction from the sound source toward the observer is positive and the speed is v _s , v ₀ , the frequency f ₃ satisfies the following equation.

&Quot; (5) "

The Doppler radar sensor uses this principle to project a radio wave or radio frequency (RF) signal of a specific frequency to a moving object, and based on the variation of the characteristic of the reflected radio wave or RF signal depending on the direction and velocity of movement of the object And determines the moving state of the object. A moving state of an object that can be detected by the Doppler radar sensor can be variously provided in the manner of implementing the Doppler radar sensor.

Hereinafter, the principle of the Doppler radar sensor 300 for sensing the velocity of the object 240 will be described with reference to FIG.

4 is an exemplary diagram illustrating the principle of a Doppler radar sensor 300 in a manner that senses the velocity of an object 240. FIG.

4, the frequency of the moving object 240 is changed in proportion to the speed of the moving object 240, so that the Doppler radar sensor 300 calculates the changing frequency in reverse to determine the speed and direction of the moving object 240 do.

The Doppler radar sensor 300 includes an oscillator 310 for generating an RF signal or a radio wave of an initial frequency f ₀ , a transmitter 320 for projecting an RF signal generated by the oscillator 310, a transmitter 320, Based on the difference between the RF signal generated by the oscillator 310 and the RF signal received by the receiver 330. The frequency shift amount is calculated based on the difference between the RF signal generated by the oscillator 310 and the RF signal received by the receiver 330. [ and a mixer 340 for outputting f _d .

Here, the RF signal generated by the oscillator 310 and projected to the object 240 through the transmitter 320 is transmitted or transmitted, and the generated wave is generated by being reflected on the object 240, reflected by the object 240, Respectively, as a received wave or a received wireless signal, respectively.

The transmission wave generated from the first oscillator 310 is projected to the outside through the transmission unit 320, reflected by the object 240, reflected thereafter, and received by the reception unit 330 as a reception wave. The mixer 340 compares the frequency of the transmission wave and the frequency of the reception wave to derive the difference.

When the moving speed of the object 240 is v and the angle between the moving direction axis of the object 240 and the projection direction axis of the RF signal from the transmitting unit 320 is α, And the frequency shift amount f _d between the reception waves satisfy the following equation.

&Quot; (6) "

Where c ₀ is the speed of light.

The moving speed of the object 240 can be calculated based on the frequency shift amount thus derived. The Doppler radar sensor 300 having such a principle can be applied to an overspeed sensor of a highway, for example, in order to sense the moving speed of the object 240 rather than the moving direction of the object 240.

However, there is a Doppler radar sensor having a principle and structure different from the above example in the case of mainly sensing the moving direction of the object 240. The principle of the Doppler radar sensor for detecting the moving direction of the object 240 includes sideband filtering, offset carrier demodulation, and in-phase and quadrature demodulation. Among them, In-phase and quadrature demodulation is abbreviated as I-Q scheme. In the following embodiments, the I-Q scheme is used as a reference.

5 is an exemplary view showing the principle of the Doppler radar sensor 400 of the I-Q system.

5, the Doppler radar sensor 400 includes an oscillator 410 for generating an RF signal, a transmitter 420 for projecting an RF signal generated from the oscillator 410 as a transmission wave, A first mixer 440 for mixing a transmission wave and a reception wave to output a first composite signal, and a second mixer 440 for shifting the phase of the transmission wave by a predetermined phase difference And a second mixer 460 for mixing the transmitting wave whose phase is shifted by the phase shifting unit 450 and the receiving wave to output a second combined signal.

Supposing that the waveform equation of the transmission wave transmitted from the transmission section 420 is X _t (t) and the waveform equation of the reception wave received by the reception section 430 is X _r (t), the transmission wave and the reception wave are expressed by the following equations Can be expressed.

&Quot; (7) "

Where ω _t is the amplitude of the transmitting wave, ω _s is the frequency of the transmitting wave, ξ _r is the amplitude of the receiving wave, ω _d is the frequency of the transmitting wave, t is the time, and φ is the phase difference. That is, a frequency difference of? _D is generated between the transmission wave and the reception wave depending on the moving direction and velocity of the object, and a phase also differs by?. Therefore, if the phase difference? Of X _r (t) is known, it can be determined whether the object moves toward or away from the Doppler radar sensor 400.

A portion of the transmission wave generated from the oscillator 410 is received through the transmitter 420 and a part of the transmission wave is transmitted to the first mixer 440 and the phase shifter 450 respectively. The transmission waves transmitted from the oscillator 410 to the transmission unit 420, the first mixer 440, and the phase shifter 450 are RF signals having the same characteristics.

The phase shifter 450 generates a phase shifted transmission wave by applying a phase difference of 90 degrees to the transmission wave from the oscillator 410 and transmits the phase shifted transmission wave to the second mixer 460. [ The reason why the phase difference applied by the phase shifter 450 to the transmission wave is 90 degrees will be described later.

The first mixer 440 receives a transmission wave from the oscillator 410 and a reception wave from the reception unit 430, respectively. The first mixer 440 mixes the transmission wave and the reception wave to generate and output the first composite signal. The first synthesized signal is referred to as a first signal or I-signal for convenience, and the waveform equation of the first synthesized signal is I (t).

The second mixer 460 receives a phase-shifted transmission wave transmitted from the phase shifter 450 and a reception wave transmitted from the receiver 430, respectively. The second mixer 460 generates and outputs the second composite signal by mixing the phase-shifted transmission wave into the reception wave. The second synthesized signal is referred to as a second signal or Q-signal for convenience, and the waveform equation of the second synthesized signal is Q (t).

Here, the first mixer 440 and the second mixer 460 mix or synthesize two signals to output a synthesized signal can be applied by applying various circuit technologies related to signal processing.

The I-signal I (t) output from the first mixer 440 and the Q-signal Q (t) output from the second mixer 460 satisfy the following equation.

&Quot; (8) "

I (t) and Q (t) have the same variables, while the trigonometric functions are different between cosine and sine because the phase difference applied to the transmitting wave by the phase shifter 450 is 90 degrees . That is, since the phase shifter 450 outputs a phase difference of 90 degrees to the transmission wave, finally the relationship between I (t) and Q (t) as in the above equation is established.

Here, A satisfies the following equation.

&Quot; (9) "

At this time, the frequencies of the I- and Q- signals remain the same, but when the object moves toward or away from the Doppler radar sensor 400, a phase difference of sign different from each other appears. The phase difference is theoretically 90 degrees, but the sign is determined to be different from each other depending on the moving direction of the object. The Doppler radar sensor 400 uses this principle to determine whether the moving direction of the object is the approach direction or the separation direction. Signs of the I- and Q- signals according to the sign of the frequency difference? _D satisfy the following equations.

&Quot; (10) "

ω _d is both the first case is greater than zero and ω _d is the case of the second case is smaller than 0, I- signal represents the (+) sign. However, the Q- signal represents the (+) sign in the first case whereas the (-) sign in the second case.

If the waveforms of the I- and Q- signals are shown on a two-dimensional basis, the phase of the Q-signal in the first case appears as "Lag" Quot; Lead "rather than the phase of the I-signal.

Here, the meaning of "ground" and "true phase" will be described with reference to Fig.

Fig. 6 is an exemplary diagram showing a comparison between the case where the phase relationship between the two signals is ground and the case where the phase is true. The first case and the second case in this figure are the same as in the preceding example. In the figure, the I- signal is indicated by a dotted line and the Q- signal is indicated by a solid line.

As shown in FIG. 6, I-signals 510 and 530 and Q-signals 520 and 540 are shown oscillating along the time axis. Looking at the phase relationship between I- signals 510, 530 and Q- signals 520, 540 in each case, I-signal 510 in the first case is in a temporally preceding form . On the other hand, in the second case, the I-signal 530 has a temporally trailing form of the Q-signal 540.

Signal 520 in the first case is formed later in time than the phase of I- signal 510 and in the second case the phase of Q-signal 540 is I- Is formed earlier in time than the phase of the signal (530). That is, in the first case the phase of the Q-signal 520 appears "above" the phase of the I-signal 510 and in the second case the phase of the Q- It appears as a "truth" rather than a phase.

Referring again to Equation 10 above, the first case in which the phase of the Q-signal 520 appears "above" the phase of the I-signal 510 is the direction in which the object approaches the Doppler radar sensor 400 ≪ / RTI > On the other hand, the second case in which the phase of the Q-signal 540 appears "higher" than the phase of the I-signal 530 means that the object moves in a direction away from the Doppler radar sensor 400.

If ω _d = 0, it means that there is no substantial phase difference between the I- signals 510 and 530 and the Q- signals 520 and 540, and this state is referred to as "in phase". The fact that the frequency shift amount is 0 means that the object does not move and is stopped.

Also, the magnitudes of the amplitudes of the I- and Q- signals vary depending on the distance between the moving object and the Doppler radar sensor 400, and appear in inverse proportion to the logarithm of the distance. Using this point, if the amplitude is larger than a predetermined threshold, it is determined that there is a moving object. By calculating the phase difference sign, the moving direction of the moving object can be determined. The amplitude A and the phase difference? Satisfy the following equation.

&Quot; (11) "

That is, according to the above equation, if the calculated amplitude is larger than the threshold value, it is possible to primarily determine whether the object moves or not, and it is possible to determine the moving direction of the object in accordance with the sign of the phase difference calculated next.

The actual I- and Q- signals output from the Doppler radar sensor 400 to which the I-Q scheme is applied have waveforms that oscillate along the time axis in the form of a sinusoidal wave. In order to determine the magnitude of the amplitude in the vibration waveform, the signal is processed through a smoothing processing method and then compared with a specific threshold value.

The smoothing technique is a method of smoothing or removing such fluctuations or discontinuities when there is microscopic fluctuation or discontinuity obstructing the analysis of the data due to rough sampling or noise. In terms of signal processing, the smoothing processing technique is applied to convert the oscillating waveform signal into a more gentle waveform to facilitate the analysis. If the type of vibration of the signal is easy to analyze, the smoothing technique may be omitted. Examples of the smoothing technique include a moving average method and low pass filtering.

The moving average method is an arithmetic average of the individual values within a specific repetition period, eliminating irregularities in short-term fluctuations of data, and is a method of grasping long-term fluctuation trends of data, that is, trend fluctuations. That is, the moving average method is one method for determining the trend value of the time series. Lowpass filtering is a method of removing high frequency components from the signal.

However, in the process of applying the actual Doppler radar sensor 400 to a product, noise may interfere with accurate signal analysis due to various causes.

Noise mixing occurs either in the interior of the system due to various oscillation devices, or due to external disturbance. Disturbances can appear in various forms, but one of the major causes of disturbance is the crosstalk phenomenon of the transmitted and received waves. Hereinafter, the crosstalk phenomenon will be described with reference to FIG.

FIG. 7 is an exemplary view of a Doppler radar sensor 600. FIG.

7, the Doppler radar sensor 600 includes a printed circuit board 610, a circuit unit 620 formed on the printed circuit board 610, A transmission unit 640 for projecting a transmission wave transmitted from the circuit unit 620 to the outside, and a reception unit 630 for receiving a reception wave from the outside, (620).

The circuitry 620 is substantially the same as the configuration of the oscillator 410, the first mixer 440, the phase shifter 450 and the second mixer 460 in the structure of the Doppler radar sensor 400 of FIG. ≪ / RTI >

The transmitting unit 640 and the receiving unit 650 are substantially the same as the configuration of the same terms in the structure of the Doppler radar sensor 400 related to FIG. Structurally, the transmitter 640 and the receiver 650 each include a 2-patch antenna including two metal nodes.

That is, the circuit unit 620 generates a transmission wave and projects it via the transmission unit 640. When the reception wave is received by the reception unit 650, the circuit unit 620 generates an I- signal and a Q- signal based on the transmission wave and the reception wave, (630). The image processing apparatus 100 determines the moving state of the object based on the I- and Q- signals output from the Doppler radar sensor 600 as described above.

Alternatively, instead of outputting the I- signal and the Q- signal through the connection unit 630, the circuit unit 620 may include a determination circuit for determining the movement state of the object, and may output the determination result regarding the movement state of the object to the connection unit 630).

Since the printed circuit board 610 is small and the RF signal generated by the circuit unit 620 has high frequency characteristics, even if a signal insulation design is made inside the circuit unit 620, the RF signal generated between the transmission unit 640 and the reception unit 650 The RF signals may interfere with each other. Specifically, there is a phenomenon that the RF signal projected from the transmitter 640 is propagated to the receiver 650 or the RF signal received by the receiver 650 is propagated to the transmitter 640, Phenomenon. When the crosstalk phenomenon occurs, the signal characteristic of the RF signal naturally changes, so that it is difficult to derive an accurate detection result.

Various noise including the crosstalk phenomenon causes an irregular change in the RF signal, resulting in a bad influence on the signal analysis. For example, the noise may be an error that the Doppler radar sensor 600 detects that the object has actually moved, or that the Doppler radar sensor 600 detects that the object has moved even though the object has not actually moved Can be generated.

Thus, the present embodiment provides a Doppler radar sensor 600 that, when noise or disturbance adversely affects signal analysis in terms of I- and Q- signals, eliminates such adverse effects, resulting in a more precise detection result And a description thereof will be given.

8 is a block diagram of the sensing unit 700 according to the present embodiment.

8, the sensing unit 700 includes a sensor module 710 that outputs I- and Q- signals, an AMP (amplifier) 720 that amplifies the signals, and a high- A low pass filter (LPF) 730 for filtering an area, an ADC (AC / DC converter) 740 for converting each signal from analog to digital, and a detection processing unit (750).

In this embodiment, the sensing unit 750 is separately provided as a sub-configuration of the sensing unit 700. However, the manner in which the spirit of the present invention is implemented in the image processing device 100 is not limited thereto. The sensor module 710, the AMP 720 and the LPF 730 in the sensing unit 700 can be classified into analog processing blocks and the ADC 740 and the sensing processing unit 750 can be classified into digital processing blocks . In an implementation form of each processing block, the analog processing block is implemented as a hardware circuit, and the digital processing block can be implemented as a micro controller unit (MCU) or other configuration within the image processing apparatus 100. For example, the sensing unit 700 includes only the sensor module 710, and the AMP 720, the LPF 730, the ADC 740, and the sensing processing unit 750 are connected to the processing unit 120 (see FIG. 2) (See FIG. 2) may perform the corresponding function. In particular, the sensing unit 750 may replace the role of the controller 170 (see FIG. 2).

The sensor module 710 performs functions of generating an RF signal, projecting a transmission wave, receiving a reception wave, and generating and outputting an I- and a Q- signal. The sensor module 710 can be applied by applying the Doppler radar sensor described above (refer to 400 of FIG. 5 and 600 of FIG. 7), and a detailed description thereof will be omitted.

The AMP 720 amplifies the I- and Q- signals output from the sensor module 710 to a predetermined level. Since the I-signal and the Q-signal output from the sensor module 710 have a relatively small scale, it is preferable to amplify the I-signal and the Q-signal for more accurate and easy signal analysis.

The LPF 730 filters over the predetermined frequency band for the I- and Q- signals. In this embodiment, the LPF 730 is shown as being behind the AMP 720, but it may be different depending on the designing method, and the LPF 730 may be at the front end of the AMP 720. The reason why the LPF 730 filters the high frequency region is as follows. The system noise generated in the image processing apparatus 100 is relatively high in frequency, while the disturbance is relatively low in frequency. Accordingly, the LPF 730 filters the high frequency region and passes through the low frequency region, thereby eliminating system noise.

The ADC 740 converts the I- and Q- signals from analog to digital and outputs them to the sensing processor 750 so as to be able to analyze the I- and Q- signals.

The sensing processing unit 750 analyzes the digitized I-signal and the Q-signal, and determines whether or not the object moves and the moving direction over time. Here, the detection processing unit 750 performs a processing operation to exclude detection errors due to system noise and disturbance in determining whether or not an object moves, and performs the characteristic operation in this embodiment.

As described above, the detection processing unit 750 detects the movement of the object based on the amplitude between the I- and Q- signals. If the amplitudes of the I- and Q- signals generated by the movement of the object are greater than or equal to a certain threshold value, the detection processing unit 750 determines that the moving object is sensed. Here, the detection processing unit 750 does not compare the amplitudes of the I- and Q- signals individually with the threshold values, but combines or combines the I- and Q- signals according to predetermined equations to generate a synthesized signal And compares the amplitude of the synthesized signal with a threshold value. Here, for convenience, the synthesized signal obtained by synthesizing the I-signal and the Q-signal is referred to as a C (Composition) -signal.

The synthesis method or formula of the I-signal and the Q-signal for generating the C-signal is subjected to a normalization processing method. Examples of the normalization processing method include a signal envelop operation and a norm operation.

9 is an exemplary diagram showing the principle of signal envelope computation.

As shown in Fig. 9, the signal envelope operation is performed when a signal having a relatively large value among two signals 810 and 820 at a time point when there are two signals, for example, an I-signal 810 and a Q- . In this embodiment, the C-signal th _envelope generated by signal enveloping the I- signal 810 and the Q- signal 820 is expressed by the following equation.

&Quot; (12) "

Here, the abs function is a function that returns the absolute value of the input number. That is, the above equation returns a relatively large value for each of the I-signal 810 and the Q-signal 820. Accordingly, when the C-signal th _envelope 830 calculated by the signal envelope operation is represented by a waveform, it appears as a line connected along the upper outline of the I- signal 810 and the Q-

On the other hand, norm is a function for giving length or size to vectors of vector space in linear algebra and function analysis. The norm of the zero vector is zero, and all other vectors have a positive real number norm. For example, the 2-norm operation and the infinit-norm operation on the vector x = [x ₁ , x ₂ , ..., x _n ] on the n-dimensional Euclidean space R ⁿ satisfy the following equations respectively.

&Quot; (13) "

In this embodiment, the C-signal th _2-norm generated by 2-norm operation of the I- and Q- signals is expressed by the following equation.

&Quot; (14) "

The C- signal generated from the I-signal and the Q-signal through the normalization processing method is finally compared with the threshold value after the processing of the smoothing processing method such as the moving average method and the low-pass filtering. That is, it can be judged that the movement of the object is detected in the time domain in which the amplitude of the C-signal traveling along the time is larger than the threshold value.

However, as described above, the amplitude of the C-signal may be larger than the threshold value even when noise or disturbance affects the I- and Q- signals in a single time interval. The reason why the amplitude of the C-signal is larger than the threshold value in a specific time period is twofold, that is, due to movement of the object and noise / disturbance. It should be excluded.

10 is an exemplary diagram showing waveform changes of I- and Q- signals when the object is moved and when disturbance occurs, respectively.

As shown in Fig. 10, the waveforms of the I-signal and the Q-signal are shown along the time axis. Since both the first case 850 and the second case 860 are larger than the preset threshold value Th, it can be determined that movement of the object or disturbance has occurred in these time periods.

The first case 850 appears such that the phase difference between the I- and Q- signals is 90 degrees. Considering the point generated by mixing the Q-signal with the receiving wave after 90 degrees of phase shifting of the transmitted wave, the first case can be regarded as a normal state.

However, in the second case 860, the phase difference between the I-signal and the Q-signal is substantially the same. Considering the generation method of the Q-signal, a waveform must be displayed between the I-signal and the Q-signal so as to have a phase difference equal to or greater than a predetermined value, even if the error range is considered. However, the fact that there is substantially no phase difference between the I-signal and the Q-signal is considered to be caused by an unintended cause in the design, and it can be judged that it is caused by noise or disturbance as described above.

In consideration of this point, the image processing apparatus 100 according to the present embodiment operates according to the following method.

The image processing apparatus 100 specifies a time interval satisfying preset signal characteristics of a transmission wave and a reception wave and determines whether or not distortion occurs in a phase difference between a transmission wave and a reception wave in a time interval satisfying the signal characteristics And determines whether or not the object has moved on the basis of the time period. When the phase difference between the transmission wave and the reception wave is smaller than a predetermined threshold value, the image processing apparatus 100 determines that distortion occurs in the phase difference between the transmission wave and the reception wave, and determines that the object has not moved .

In the present embodiment, it is described that the distortion of the phase difference is determined by specifying the time interval, but the spirit of the present invention is not limited to this. For example, the image processing apparatus 100 may determine whether the signal characteristics are satisfied on a point-by-point basis, and determine whether the phase difference is distorted.

As a specific method for judging the distortion of the phase difference between the transmission wave and the reception wave, the image processing apparatus 100 performs a phase shift of an I-signal synthesizing a transmission wave and a reception wave and a Q- Is satisfied in the corresponding time period. Whether or not the signal characteristic condition is satisfied depends on whether the amplitude of the C-signal synthesized by normalizing the I- and Q- signals is greater than a preset threshold value. The threshold value mentioned here is different from the threshold value related to the phase difference between the transmission wave and the reception wave.

Here, if the signal characteristic condition is satisfied, the image processing apparatus 100 determines whether the object moves in the corresponding time period based on the phase difference between the I- signal and the Q- signal in the corresponding time period. That is, if the phase difference between the I-signal and the Q-signal is substantially 90 degrees or greater than a predetermined value, the image processing apparatus 100 determines that the object moves, If the phase difference is substantially zero or smaller than a predetermined value, it is determined that the phase difference is abnormal due to disturbance.

Thus, the image processing apparatus 100 can eliminate signal disturbance due to noise or disturbance when detecting the movement of the object, and improve the accuracy of the detection result.

However, considering the characteristics of the signal, it may not be easy to directly calculate the phase difference. Theoretically, the phase difference between the I-signal and the Q-signal should be 90 ° in the normal case, but the actual signal waveform does not match the magnitude of the two signals due to noise / disturbance, and the DC offset also varies , The shape of the waveform also does not match.

DC offset means that a waveform of a signal appears in a form different from that expected at the actual design due to various hardware or software errors related to signal processing. For example, when designing, it is expected that the initial value of the amplitude of the signal is 0, but in practice, the initial value may be formed with a value other than 0. In the signal processing, the correction process considering this error should be reflected.

The method of calculating the phase of a signal includes a Fast Fourier Transform (FFT) technique and a technique using an arctangent function. Here, the technique using the arctangent function has been described in Equation (11). The FFT is designed to reduce computation time by calculating discrete Fourier transform using approximate formula based on Fourier transform.

According to FFT, accurate frequency and phase values can be derived, but in order to use FFT, MCU or DSP (Digital Signal Processing) capable of fast operation is required. Therefore, it is more appropriate to use the arctangent function than the FFT when the image processing apparatus 100 is a home appliance such as a TV having limited system resources.

However, in order to calculate the exact phase difference between two signals using the arctangent function, it is possible that the shapes of the two signals are exactly the same and the DC offset is also exactly the same. However, since various noise is mixed into the signal in reality, various numerical errors occur. If the simple phase difference calculation using the arctangent function using the noise mixed signal is performed, the reliability of the result may be problematic.

Accordingly, the image processing apparatus 100 according to the present embodiment operates in the following manner.

The image processing apparatus 100 generates a D (Differential) signal, which is a new signal based on the difference between the I- signal and the Q- signal, and determines whether the D- signal is greater than a preset threshold value And determines the phase difference in the corresponding time interval. The predetermined threshold value described herein is a threshold different from the C-signal related threshold value in the above embodiment. Each threshold value is determined from accumulated data through experiments in various environments, and thus can not limit concrete values.

Here, the difference between the I- signal and the Q- signal means a difference in amplitude by the viewpoint. Also, the fact that the D- signal is greater than a predetermined threshold means that the amplitude of the D- signal is greater than the threshold.

If the D- signal is larger than the threshold value, the image processing apparatus 100 determines that the I- and Q- signals have a phase difference of more than a specific value, and determines that the object has moved. On the other hand, when the D- signal is not larger than the threshold value, the image processing apparatus 100 determines that the I- signal and the Q- signal do not have a phase difference of more than a certain value, and determines that disturbance has occurred in which the object is not moved.

Thereby, the image processing apparatus 100 can easily determine the phase difference between the I-signal and the Q-signal using limited system resources.

A method for generating a D-signal based on a difference between an I-signal and a Q-signal can be applied to various mathematical techniques such as the difference of the Q-signal with respect to the I- The absolute value of the difference between the I- signal, the I- signal and the Q- signal, the n-squared difference between the I- signal and the Q- signal, and so on. Here, n is an integer larger than 0, and n = 2 is mainly used. Of course, for each method, thresholds for comparison must be provided separately. These methods can be expressed by the following equations.

&Quot; (15) "

As described above, when a disturbance occurs, the I- and Q- signals do not substantially exhibit a phase difference even if the diarrhea amplitude is larger than the threshold value Th (see 860 in FIG. 10). That is, the I-signal and the Q-signal indicate a true phase or a ground state in a normal case, and an in-phase state in an abnormal case. If the I- and Q- signals represent an in-phase, the difference in amplitude between the I- and Q- signals is also substantially zero or very small.

Therefore, it is possible to determine whether the phase difference is substantially or not between the I- and Q- signals by generating the D- signal through the above equation and comparing the D- signal with a preset threshold value. On the other hand, even in this case, if the vibration of the D-signal is excessive and analysis is not easy, the smoothing process may be performed on the D- signal and the smoothed D- signal may be compared with the threshold value.

Hereinafter, the progress of the control method according to the present embodiment will be described.

11 is a flowchart showing a process of determining whether or not the image processing apparatus 100 has moved an object.

As shown in Fig. 11, the image processing apparatus 100 projects a transmission wave to an object in step S110, and receives a reception wave reflected by the object.

In step S120, the image processing apparatus 100 mixes the transmission wave and the reception wave to generate an I-signal. The image processing apparatus 100 generates a Q-signal by mixing the received wave with the receiving wave after shifting the transmitting wave by 90 degrees in step S130.

In operation S140, the image processing apparatus 100 mixes and smoothes the I- and Q- signals through a normalization process to generate a C- signal.

In step S150, the image processing apparatus 100 determines whether the C-signal in one time interval is greater than a predetermined first threshold value.

If it is determined in step S150 that the C- signal in the corresponding time interval is larger than the first threshold value, the image processing apparatus 100 determines whether there is a phase difference between the I- signal and the Q- signal in step S160.

If it is determined in step S160 that the phase difference between the I- signal and the Q- signal is substantial, that is, if the I- signal and the Q- signal indicate a true phase or a ground phase, the image processing apparatus 100, in step S170, It is determined that the object has moved.

On the other hand, if it is determined in step S160 that there is substantially no phase difference between the I- signal and the Q- signal, that is, if the I- signal and the Q- signal exhibit a mutual phase, the image processing apparatus 100, in step S180, It is determined that the object has not moved.

On the other hand, if it is determined in step S150 that the C-signal in the corresponding time interval is not larger than the first threshold value, the image processing apparatus 100 determines in step S180 that the object has not moved in the corresponding time period.

12 is a flowchart showing a process of the image processing apparatus 100 determining a phase difference in order to determine whether or not an object moves. The process of this flow chart more specifically shows the step S160 of FIG.

As shown in Fig. 12, in step S210, the image processing apparatus 100 generates a D- signal based on the difference between the I-signal and the Q-signal.

In step S220, the image processing apparatus 100 determines whether the D- signal is greater than a predetermined second threshold value.

If it is determined in step S220 that the D- signal is larger than the second threshold value, the image processing apparatus 100 determines that there is substantially a phase difference between the I- signal and the Q- signal in step S230, that is, It is judged that they represent a true phase or a ground.

On the other hand, if it is determined in step S220 that the D- signal is not larger than the second threshold value, the image processing apparatus 100 determines that there is substantially no phase difference between the I- signal and the Q- signal in step S240, It is judged that the Q-signals exhibit the same phase with each other.

Hereinafter, the present embodiment will be described with reference to experimental data in which this embodiment is implemented. Hereinafter, the embodiment will be described with reference to a relative comparison as to how the idea of the present invention can be implemented. Therefore, detailed experimental conditions are not specified.

13 is a graph showing an example of each waveform of the I- and Q- signals derived according to the experimental result.

As shown in Fig. 13, the I-signal and the Q-signal form a waveform with time. The horizontal axis is the time in seconds. The ordinate is the amplitude. In this embodiment, since the normalization is reflected for the relative comparison, the unit is not considered. This applies equally to the graphs in the following figures.

In this graph, the I- and Q- signals are shown, but the graph scale is small, so it is not shown to distinguish between the two signals. In this graph, only the amplitude is considered without distinguishing between the I- and Q- signals.

In terms of amplitude, a time interval A1 between 0 seconds and 1 second, a time interval A2 around 3 seconds, a time interval between 7 seconds and 8 seconds, a time interval between A3, 8 seconds, and 9 seconds, It can be seen that a relatively large vibration occurs in the I-signal and the Q-signal in the interspace A5. In other words, it can be seen that any one of the movement of the object and the disturbance occurred in these time zones A1 to A5.

In this experiment, the movement of the object actually occurs only in the time interval A1, and the movement of the object does not occur in the remaining time intervals A2 to A5. Since the time periods A2 to A5 are erroneous detection periods, it is important to detect only the time interval A1.

14 is a graph showing an example of the waveform of the C- signal based on the I- signal and the Q- signal shown in Fig.

As shown in Fig. 14, the first waveform 910 is a waveform of the C- signal generated by normalizing the I- and Q- signals shown in Fig. 13 above. The first waveform 910 of the C-signal is generated by signal enveloping the I- and Q- signals. Since the first waveform 910 has a large vibration, it is not easy to compare the first waveform 910 with the first threshold Th1. Therefore, the first waveform 910 is smoothed to the second waveform 920 and the first threshold value Th1 ) Is performed.

The second waveform 920 is larger than the first threshold value Th1 in the time interval A1 corresponding to the normal case. However, since the second waveform 920 is still larger than the first threshold value Th1 in the time zones A2, A4, and A5, the analysis based on the amplitude of the C-signal also shows that abnormal cases can not be excluded .

15 is a graph showing an example of the waveform of the D- signal based on the I- and Q- signals shown in Fig.

15, the third waveform 930 is the waveform of the D- signal generated based on the difference between the I- and Q- signals shown in FIG. 13, and the fourth waveform 940 is the waveform of the third And the waveform 930 is smoothed. Here, the third waveform 930 is derived based on th _dffr3 (t) in the above-described equation (15).

When the fourth waveform 940 is compared with the second threshold value Th2, the amplitude value of the fourth waveform 940 is formed to be larger than the second threshold value Th2 in the time interval A1. On the other hand, in the remaining time periods A2 to A5, the amplitude value of the fourth waveform 940 is formed to be smaller than the second threshold value Th2. This means that, unlike the case of FIG. 14, the abnormal case can be excluded by distinguishing the normal case from the abnormal case by analysis based on the amplitude of the D- signal.

16 is an enlarged graph of time interval A1 in Fig.

As shown in Fig. 16, the phase difference A1 between the I-signal 950 and the Q-signal 960 appears in the normal time interval A1. Of course, the waveforms of the I-signal 950 and Q-signal 960 do not exactly coincide with each other for various reasons such as DC offset as described above, and the phase difference between the waveforms is constant It does not appear. However, it can be seen that there is a clear phase difference between the I- signal 950 and the Q- signal 960 in the vicinity of 0.5 to 0.6 seconds when large amplitude of vibration occurs.

17 is an enlarged graph of time interval A1 in Fig.

As shown in FIG. 17, the second waveform 920 obtained by smoothing the first waveform 910 of the C-signal has a first threshold value Th1 at about 0.5 to 0.6 seconds when a large amplitude of vibration occurs, It appears large. In addition, the second waveform 920 goes down from the vicinity of 0.9 seconds to the first threshold value Th1, and it can be seen that the object does not move from this point of time.

Fig. 18 is an enlarged graph of time interval A1 in Fig. 15. Fig.

As shown in Fig. 18, the fourth waveform 940 obtained by smoothing the third waveform 930 of the D-signal is also a second threshold value Th2 ). In addition, the fourth waveform 940 goes down from the vicinity of 0.9 seconds to the second threshold value Th2, and it can be seen that the object does not move from this point of time.

That is, in the case of the normal case due to the movement of the object, since the change in the amplitude is noticeable both in the case of Fig. 17 related to the C- signal and in the case of Fig. 18 related to the D- signal, the comparison with the threshold values Th1 and Th2 It is possible to detect whether or not the object is moving.

On the other hand, the abnormal case due to the disturbance is as follows.

FIG. 19 is an enlarged graph of time interval A2 in FIG.

As shown in Fig. 19, I-signal 950 and Q-signal 960 are shown along the time axis. However, the I-signal 950 and the Q-signal 960 of this graph have almost no phase difference between the two signals unlike the case of Fig. Signal 950 and the phase of the Q- signal 960 substantially coincide, that is, the I-signal 950 and the Q- signal 960, in the vicinity of 2.9 seconds, Can be confirmed to be substantially zero.

Fig. 20 is an enlarged graph of time interval A2 in Fig. 14. Fig.

As shown in FIG. 20, the second waveform 920 obtained by smoothing the first waveform 910 of the C-signal has an amplitude value (amplitude) larger than the first threshold Th1 at about 2.9 seconds, . Since the time interval A2 is abnormal due to disturbance rather than movement of the object, it is difficult to distinguish between the normal case and the abnormal case by analyzing the C-signal.

Fig. 21 is an enlarged graph of time interval A2 in Fig.

As shown in Fig. 21, the fourth waveform 940 obtained by smoothing the third waveform 930 of the D- signal has amplitude (amplitude) smaller than the second threshold value Th2 in the vicinity of 2.9 seconds, Quot; value ". In other words, although the large amplitude of the amplitude is generated in the time interval A2, the large amplitude of the amplitude is not caused by the movement of the object, but the phase difference is not substantially generated.

Therefore, by analyzing the D-signal, abnormal cases can be distinguished and excluded.

In the above embodiments, the present invention is applied to an image processing apparatus 100 such as a TV or a set-top box, but the present invention is not limited thereto. The sensing analysis structure and method described in the foregoing embodiments can be applied to various types of electronic devices that perform functions independent of image processing functions such as the image processing apparatus 100. [

In the above embodiments, the detection and analysis configuration including the Doppler radar sensor is installed in the image processing apparatus 100. However, the embodiment of the present invention is not limited thereto.

22 is a block diagram of the configuration of an image processing apparatus 1100 according to another embodiment of the present invention.

22, the image processing apparatus 1100 includes a communication unit 1110, a processing unit 1120, a display unit 1130, an input unit 1140, a storage unit 1150, a control unit 1160, . Since the basic functions of these components of the image processing apparatus 1100 are substantially the same as those of the same term shown in FIG. 2, detailed description will be omitted.

The sensor module 1200 is an I-Q type Doppler radar sensor structure and operates in accordance with the structure and principle as described in the previous embodiments. The sensor module 1200 is configured separately from the image processing apparatus 1100 and transmits information for determining the moving state of the object or the determination result of the moving state of the object to the communication unit 1110.

The sensor module 1200 can generate only the I- and Q- signals and transmit them to the communication unit 1110. In this case, the control unit 1160 determines whether the object has moved or not based on the I- signal and the Q- signal received in the communication unit 1110, and executes the corresponding operation according to the determination result.

Alternatively, the sensor module 1200 may not only generate the I-signal and the Q-signal, but also transmit the determination result to the communication unit 1110 after determining whether or not the object is moved based on the signals. In this case, the control unit 1160 executes the corresponding operation in accordance with the determination result received by the communication unit 1110. [

In the above embodiments, the case where the sensing unit included in the image processing apparatus includes the Doppler radar sensor has been described. However, depending on the design method of the image processing apparatus, the sensing unit may include various types of sensors such as a Doppler radar sensor, i.e., a Doppler sensor, for example, an infrared sensor. Accordingly, it is also possible for the image processing apparatus to operate in combination with sensors of different methods.

For example, since the Doppler sensor generates a high frequency, the power source is relatively large, so that generating a high frequency by continuously activating the Doppler sensor may not be preferable from the viewpoint of power saving. Activating the Doppler sensor in the absence of a person can be a waste of energy. In this case, the image processing apparatus can use an infrared sensor having a relatively small power source to reduce the power required for utilizing the Doppler sensor. This embodiment will be described with reference to Fig.

23 is a flowchart related to a control method of an image processing apparatus according to another embodiment of the present invention. In this embodiment, it is assumed that the image processing apparatus includes a Doppler sensor and an infrared sensor.

As shown in Fig. 23, the image processing apparatus activates the infrared sensor and deactivates the Doppler sensor in step S310. In response to the activation of the infrared sensor, the image processing apparatus determines whether the user is detected in the external environment by the infrared sensor in step S320.

If it is detected in step S320 that the user is present by the infrared sensor, the image processing apparatus activates the Doppler sensor in step S330. The image processing apparatus may further deactivate the infrared sensor or maintain the activation of the infrared sensor at step S330.

The image processing apparatus determines the movement state of the user by the Doppler sensor in step S340. The above description can be applied by applying the foregoing embodiment.

On the other hand, if it is detected in step S320 that the user is not present by the infrared sensor, the image processing apparatus maintains the current state and continues monitoring by the infrared sensor.

Thus, the power consumption level due to the Doppler sensor can be reduced.

Meanwhile, the Doppler radar sensor described in the above embodiments, particularly, the sensor module as shown in FIG. 7 can be installed at various positions in the display device, and various types of installation of the sensor module will be described below.

Fig. 24 is an exemplary view showing a mounting type of the Doppler radar sensor 1333. Fig.

24, the display apparatus 1300 includes a display unit 1310 implemented as a display panel in front, a bezel 1320 surrounding and supporting the four corners of the display unit 1310, a bezel 1320, And a sensor unit 1330 provided on the upper side of the sensor unit 1330.

The bezel 1320 is coupled to a rear cover (not shown) that covers the rear of the display portion 1310 and accommodates the display portion 1310.

The sensor unit 1330 may be installed to have a fixed position on the upper side of the bezel 1320 or may be moved between a use position exposed on the upper side of the bezel 1320 and a standby position accommodated inside the bezel 1320 . The movement of the sensor unit 1330 between the use position and the standby position can be performed by a user's manual operation, or the user can operate the remote controller (not shown) ≪ / RTI >

The sensor unit 1330 includes one or more sensor modules of various kinds, for example, a camera 1331 and a Doppler radar sensor 1333. In addition, the sensor unit 1330 may have various types of sensor modules such as an infrared sensor. When two or more sensor modules are installed in the sensor unit 1330, the sensor modules are installed so as to be spaced apart from each other to avoid mutual interference. For example, in the sensor unit 1330, the Doppler radar sensor 1333 is arranged side by side with the camera 1331 so as not to interfere with the shooting of the camera 1331.

However, the form in which the Doppler radar sensor is installed in the display device is not limited to this example, and various other types of installation are possible.

Fig. 25 is an exemplary view showing a rear view of the display device 1400, and Fig. 26 is a cross-sectional view showing a main portion cut along the line A-A in Fig.

25 and 26, the display device 1400 includes a display unit 1410 implemented as a display panel, a bezel unit 1420 supporting the four edges of the display unit 1410, a display unit 1410, And a support frame 1440 for supporting the rear portion of the display portion 1410 in the rear cover 1430. The rear cover 1430 covers the back of the display portion 1410. [ A space 1450 is formed between the support frame 1440 and the rear cover 1430 to form a space 1450 in which a subcomponent of the display device 1400 including an image processing board Can be supported.

The Doppler radar sensor 1460 is installed below the support frame 1440. Here, since the support frame 1440 generally includes a metallic material, it is not easy for a wireless signal to pass through the support frame 1440. [ An opening 1451 is formed in the lower side of the accommodation space 1450. The transmission wave transmitted from the Doppler radar sensor 1460 is projected to the outside through the opening 1451 and the reception wave reflected by the outside user Is received by the Doppler radar sensor 1460 through this opening. The Doppler radar sensor 1460 is installed in the support frame 1440 in such a manner that the plate surface for transmitting and receiving radio signals is inclined toward the opening 1451 for easy transmission and reception of radio signals.

Since the object to be sensed by the Doppler radar sensor 1460 is located in front of the display device 1400, the reflection plate 1470 that reflects the radio signal emitted from the Doppler radar sensor 1460 toward the front Can be additionally installed. The reflection plate 1470 is installed at a position where the opening 1451 is located in the rear cover 1430 so as to face the Doppler radar sensor 1460. The reflection plate 1470 has a reflection surface processed to reflect a radio signal, and the reflection surface is implemented in a flat shape, a bent shape, a curved shape, or the like. The reflection plate 1470 reflects the radio signal emitted from the Doppler radar sensor 1460 toward the front of the display device 1400 and also transmits the radio signal received from the front of the display device 1400 to the Doppler radar sensor 1460 ).

Thus, since the present embodiment detects movement of a user through an RF sensor such as a Doppler radar sensor and performs a preset operation corresponding to the detection result, it is installed at a fixed position to detect whether the user is moving It is desirable to perform the sensing operation. Therefore, the present embodiment is applied to an image processing apparatus in which a mobile device that is portable by a user is installed on one mounting surface and is generally fixed at one position among various types of electronic apparatuses. Examples of the image processing apparatus include a TV, an electronic billboard, or the like, which is mounted on a floor surface such as a wall surface or seated on a desk surface or a floor surface.

Hereinafter, an example in which a preset operation is executed in response to whether or not a user moves is described in a display device 1500 to which the present embodiment is applied.

27 to 29 are exemplary diagrams showing an example in which the predetermined operation is performed in the display device 1500 in response to whether or not the user U is moving.

27, the display device 1500 includes a display unit 1510 for displaying an image and a sensor module 1520 for sensing movement of the user U. As shown in FIG. The sensor module 1520 is the Doppler radar sensor described in the foregoing embodiment, and the detailed description of the display device 1500 and the sensor module 1520 can be applied to the above embodiments, so that detailed description will be omitted.

The display device 1500 senses the movement of the user U by the sensor module 1520 and when the user U moves to approach the display device 1500 and when the user U moves to the display device 1500 In response to the movement of each of the first and second movable members 22, 22, 22, and 23, respectively.

An example of a predetermined corresponding operation is as follows. When the display device 1500 determines that the user U moves away from the display device 1500 while the image is displayed on the display unit 1510, the display device 1500 increases the volume of the image by a predetermined level. Here, the rising level of the volume can be designated in advance so as to correspond to the moving distance of the user U. If the user U moves away from the display device 1500 beyond a predetermined distance, the volume is no longer raised, the volume returns to the default level, or the system power of the display device 1500 is turned off Various other corresponding operations may be executed.

28, when the display device 1500 determines that the user U moves to approach the display device 1500 while the image is displayed on the display unit 1510, the display device 1500 displays the volume of the image Lower by a preset level. Here, the falling level of the volume may correspond to the moving distance of the user U similarly to the case of the rising level of the volume. If the user U approaches the display device 1500 within a predetermined distance range, the volume may be set so as not to descend further.

In this way, the display device 1500 selectively performs the rise and fall of the volume level in accordance with whether the user U moves and moves. The method of detecting whether the user U is moved by the sensor module 1520 is as described in the previous embodiments.

However, there is a case where the sensor module 1520 detects that the user U has moved due to a disturbance generated in the sensor module 1520 in spite of the fact that the user U has not actually moved. The main cause of the disturbance is signal interference between a transmitter (not shown) for transmitting a radio signal in the sensor module 1520 and a receiver (not shown) for receiving a radio signal. If the display device 1500 can not determine the disturbance, a situation may occur in which the display device 1500 performs a predetermined operation corresponding to the user movement even though the user has not moved.

According to the present embodiment, when the sensor module 1520 detects that the user U has moved at a point in time, the display device 1500 determines whether disturbance has occurred at that point in time. The method of determining whether disturbance has occurred is as described in the previous embodiments. The display device 1500 selectively blocks the execution of the corresponding operation at that time point in response to the determination result as to whether or not disturbance has occurred.

For example, when the sensor module 1520 detects that the user U has moved, the display device 1500 determines whether a disturbance has occurred at that point in time. If it is determined that no disturbance has occurred, the display device 1500 determines that the detection result by the sensor module 1520 is caused by the movement of the user U, Up or down.

On the other hand, if it is determined that disturbance has occurred, the display device 1500 determines that the sensed result by the sensor module 1520 is due to the disturbance, and does not adjust the volume of the image.

Accordingly, the display apparatus 1500 according to the present embodiment detects whether or not the user U is moving and executes a preset operation corresponding to the detection result, The reliability of the operation can be guaranteed.

As shown in FIG. 29, when the display device 1500 determines that a disturbance has occurred, the display device 1500 can notify the user by displaying the determination result. The display device 1500 can detect whether disturbance has occurred by detecting the movement of the user U by the sensor module 1520 in a case where the display device 1500 is previously set to adjust the volume corresponding to the movement of the user U, .

If it is determined that the disturbance does not occur, the display device 1500 determines that the detection result of the sensor module 1520 is reliable, and adjusts the volume as previously set.

On the other hand, if it is determined that the disturbance has occurred, the display device 1500 determines that the detection result of the sensor module 1520 is unreliable, so that the adjustment of the volume is not performed. In addition, the display apparatus 1500 informs the user of the UI 1511 by displaying on the display unit 1510 a message indicating that adjustment of the preset volume has not been performed since the occurrence of the disturbance has been detected. If the UI UI 1511 is displayed when the user U does not move, the user U can determine that the display device 1500 is operating normally. However, if the UI 1511 is displayed despite the movement of the user U, the user U can determine that the display device 1500 is not operating normally. Thus, the user U can take measures to allow the display device 1500 to be repaired.

By displaying the UI 1511 in this manner, the user can determine whether the display device 1500 can normally determine the movement of the user U.

The methods according to exemplary embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. Such computer readable media may include program instructions, data files, data structures, etc., alone or in combination. For example, the computer-readable medium may be a volatile or non-volatile storage device, such as a storage device such as a ROM, or a memory such as a RAM, a memory chip, a device, or an integrated circuit, whether removable or rewritable. , Or a storage medium readable by a machine (e.g., a computer), such as a CD, a DVD, a magnetic disk, or a magnetic tape, as well as being optically or magnetically recordable. It will be appreciated that the memory that may be included in the mobile terminal is an example of a machine-readable storage medium suitable for storing programs or programs containing instructions for implementing the embodiments of the present invention. The program instructions recorded on the storage medium may be those specially designed and constructed for the present invention or may be those known to those skilled in the art of computer software.

The above-described embodiments are merely illustrative, and various modifications and equivalents may be made by those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined by the technical idea of the invention described in the following claims.

100: image processing device
110:
120:
130:
140: Input unit
150:
160, 400, 700:
410: Oscillator
420:
430:
440, 460: Mixer
450: phase shifter
710: Sensor module
720: AMP
730: LPF
740: ADC
750:

Claims (16)

1. A display device provided on a mounting surface,
A display unit for displaying an image;
A transmission unit for generating a transmission radio signal, a transmission unit for making electrical contact with the circuit unit and transmitting the transmission radio signal from the circuit unit to an external device to be sensed by an external device, A sensing module including a receiver for receiving a received wireless signal;
If the amplitude variation of the transmission radio signal and the reception radio signal through the sensing module is greater than a predetermined first threshold value and the phase difference between the transmission radio signal and the reception radio signal is greater than a predetermined second threshold value, And at least one processor for determining that the body has moved and performing predetermined correspondence signal processing according to the determination result. The method according to claim 1,
Wherein the at least one processor does not move the subject if the amplitude variation is larger than the first threshold value and the phase difference is not greater than the second threshold value and a noise is generated due to signal interference between the transmitting section and the receiving section And does not perform the corresponding signal processing. The method according to claim 1,
Wherein the at least one processor generates a first signal obtained by synthesizing the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal, And the phase difference is determined by comparing an amplitude of a third signal generated based on a difference in amplitude between the second signal and the second threshold value. The method of claim 3,
Wherein the phase shift value of the transmitted wireless signal during the generation of the second signal is 90 degrees. The method of claim 3,
Wherein the third signal includes at least one of a difference of the second signal to the first signal, a difference of the first signal to the second signal, an absolute value of a difference between the first signal and the second signal, 1 < / RTI > signal of the first signal and the n-th power of the difference of the second signal. The method according to claim 1,
Wherein the at least one processor generates a first signal obtained by synthesizing the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal, And comparing the amplitude of the fourth signal generated by the normalization process of the second signal with the first threshold to determine the amplitude change of the transmitted wireless signal and the received wireless signal Display device. The method according to claim 6,
Wherein the normalization process is performed according to any one of a signal envelope operation and a norm operation. The method according to claim 1,
Wherein the at least one processor determines that the subject does not move if the amplitude change of the transmitted wireless signal and the received wireless signal is not greater than the first threshold value. A method of controlling a display device installed on a mounting surface,
Transmitting a transmission radio signal from the transmission unit to an external touch sensing object;
Receiving a reception radio signal reflected by the surface of sight sensor by a reception unit;
If the amplitude change of the transmission radio signal and the reception radio signal is larger than a predetermined first threshold value and the phase difference between the transmission radio signal and the reception radio signal is larger than a predetermined second threshold value, And performing predetermined corresponding signal processing according to a result of the determination. 10. The method of claim 9,
If the amplitude change is larger than the first threshold value and the phase difference is not greater than the second threshold value, it is determined that the subject does not move and noise is generated due to signal interference between the transmitter and the receiver, Further comprising the step of not performing signal processing. 10. The method of claim 9,
Wherein,
Generating a first signal synthesized with the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal;
And comparing the amplitude of the third signal generated based on the difference in amplitude between the first signal and the second signal with the second threshold value to determine the phase difference. Control method. 12. The method of claim 11,
Wherein the phase shift value of the transmitted wireless signal during the generation of the second signal is 90 degrees. 12. The method of claim 11,
Wherein the third signal includes at least one of a difference of the second signal to the first signal, a difference of the first signal to the second signal, an absolute value of a difference between the first signal and the second signal, 1 < / RTI > signal of the first signal and the n-th power of the difference of the second signal. 10. The method of claim 9,
Wherein,
Generating a first signal synthesized with the transmission radio signal and the reception radio signal and a second signal synthesized with the reception radio signal by shifting the transmission radio signal;
And comparing the amplitude of the fourth signal generated by the normalization process of the first signal and the second signal to the first threshold to determine the amplitude change of the transmitted wireless signal and the received wireless signal The control method comprising the steps of: 15. The method of claim 14,
Wherein the normalization process is performed according to any one of a signal envelope calculation and a norm calculation. 10. The method of claim 9,
Further comprising the step of determining that the subject does not move if the amplitude change of the transmitted wireless signal and the received wireless signal is not greater than the first threshold value.

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